[Bug 83331] radeon: Laptop panel out of sync after dpms standby/suspend/off

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83331

--- Comment #5 from Klaus Kusche <klaus.kusche at computerix.info> ---
Any news on this one?

Some more info's:

1.) Still there on 3.16.2.

2.) My workaround (disabling and re-enabling the internal output) takes ages:

~: time xrandr --output eDP --off ; time xrandr --output eDP --auto

real    0m0.516s
user    0m0.003s
sys    0m0.004s

real    0m7.832s
user    0m0.000s
sys    0m0.003s

Times are very reproducible, almost constant (+/- 5 ms only).

During these commands, the system is more or less blocked,
in spite of the CPU being idle.
Also, the first timing is not displayed after half a second
on the external monitor as one would expect from its real time,
but after 6 seconds, one second before the second timing.

What are these commands doing that long?

3.) A similar problem seems to affect switching from VGA to FB console
during kernel bootup:
* It takes ages (I counted more than 5 seconds on a really fast machine).
* It sometimes shows the same strange white moving stripes
during the switch.

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